Guiding disk for drawing pencdls



J? m i?? 11F. Fwmmmm GUIDING DISK FOR DRAWING PEN'CILS Filed May 5, 1949 INVENTOR: James F. Fifzgerald,

ATTORNEY.

Patented Jan. 31, 1950 UNITED STATES PATENT QFFICE Claims. 1

My improvement pertains to a guidin device which may be used in combination with a pencil, the purpose of my improvement being to provide a steadying guide element in drawing, free hand, by means of a pencil, straight and curving lines. Specifically, the pencil equipped with my guide may be used to best advantage in drawing upon vertically disposed drawing boards, the pencil being guided from the shoulder and held at arm's length, the operative end of the pencil to be held close to the drawing board for a broad line, using the side of the lead only. By slidin the guide to the desired distance from the pencil point the user has a choice in the width of the line. In drawing a straight line the penoil is to be held at right angle to the line to be drawn. In drawing a circular line the pencil would be disposed in the direction of the radius at any point along said circular line.

I shall now describe my guide with reference to the accompanying drawings, in which:

Fig. 1 is a perspective view of my guide as mounted upon a pencil and as used in drawing a line upon a flat surface;

Fig. 2 is an enlarged sectional view of my guide as mounted upon a pencil;

Fig. 3 is a side elevational view of my guide as mounted upon a pencil, the View showing the relative position of the guide with respect to a sheet of paper upon which lines are to be drawn;

Fig. 4 is a sectional view on line ll4 of Fig. 2.

Similar numerals refer to similar parts throughout the several views.

The drawing shown in Fig. l discloses my roller guide, generally indicated by numeral [0, as mounted upon a pencil H. In use the guide is designed to roll over the surface l2 of the paper or other material upon which lines are to be drawn, the pencil being held at an angle to said surface. As the guide is to be used with a pencil, I shall describe the elements of said guide with reference to a pencil. Thus, the guide includes a cylindrical sleeve 13 having an inner lining l4, preferably made of rubber. The purpose of this construction is two-ioldz one is to provide means insuring a snug fit of the guide over the surface of the pencil; the other is to have means capable of self-adjustment to pencils of varied cross-sectional dimensions within the limited capacity of the lining for compression. At one end the sleeve is provided with a flange l5, including a beaded rim l6 which may be knurled. Disposed on the inner surface of the flange are a plurality of small grain-like projections ll spaced from each other and in annular arrangement about the axis of the sleeve. The end portion of the sleeve remote from the flange is threaded at its outer surface, as shown at i8. Mounted upon the sleeve, for rotation thereon, is a spool composed of a cylindrical member 19 having, at one end, an integrally connected flange disposed parallel to flange I 5, and a re"- movable circular plate 2i at the opposite end, both the flange and the plate having, on their opposed inner surfaces,-a plurality of small grainlike projections 22. Mounted within the spool co-axially therewith, is a disk-shaped rubber member or a roller 23, its rim portion being semi-circular in cross section, as best shown in Fig. 2. The side surfaces 24 of the disk are clamped by the flange Eli and plate 2 I, the grainlike projections 22 serving to be impressed into the body of the disk so that said disk will rotate with the spool upon which it is mounted.

To retain plate 2! in its position, I use a circular member 25 made, in all respects, like flange l5, except that it is not an integral part of sleeve [3 but is threaded upon it, as shown at 26. Said plate 2|, it will be noted, is provided with a bead 21 analogous to head I6. Finally, an internally threaded lock-ring 28 upon the threaded portion of sleeve l3 completes the assembly of the component elements of my roller guide.

When the parts described above are assembled, as best shown in Fig. 2, the spool, includin members I9, 20, and 2|, is adapted to rotate upon sleeve l3. Projections 22 impress into the body of rubber disk 23, causing the spool and said disk to rotate as a unit. Projections I! keep the sides of the spool in a spaced relation to flange [5 and to the retaining plate 25, respectively, so that there will be but little friction to interfere with the rotation of the spool. The friction be tween the spool and said projections I! may be adjusted by means of said lock-ring 28.

I have already described the manner of the use of my roller guide. All that needs to be said now is that said roller may be shifted upon the pencil to a desired distance from the operative end of the pencil. Once it is shifted manually the rubber lining within the sleeve l3 will hold the roller guide in place.

It will be obvious that some changes may be made in the construction of my roller guide without deviating from the inventive idea disclosed herein.

What I therefore wish to claim is as follows:

1. In combination with a pencil, a device of the kind described, said device comprising a cylindrical sleeve seated upon said pencil, a rubber lining within the sleeve for a grip upon the outer surface of the pencil, a spool mounted for rotation on the sleeve, and a disk-shaped roller axially mounted upon the spool for rotation therewith, the outer rim of the roller being semi-circular in cross-section.

2. In combination with a pencil, a device of the kind described, said device including a cylindrical sleeve mounted upon the pencil, the sleeve having at one end a disk-shaped flange, the surface of the sleeve at the other end being threaded externally, a spool mounted for rotation on said sleeve in a position adjoining said flange on one side, a retaining plate threaded upon the sleeve and adjoining said spool on the other side, a rubber disk axially mounted upon the spool for rota tion therewith, and a locking ring threaded upon the sleeve and bearing from outside against said retaining plate.

3. In combination with a pencil, a device of the kind described, said device including a cylindrical sleeve mounted upon the pencil, the sleeve having at one end a disk-shaped flange, the surface of the sleeve at the other end being threaded externally, a spool mounted for rotation on said sleeve in a position adjoining said flange on one side, a retaining plate threaded upon the sleeve and adjoining said spool on the other side, a rubber disk axially mounted upon the spool for rotation therewith, both the flange and the retaining plate having on their surfaces adjoining the spool a plurality of small projections bearing against the sides of the spool to decrease frictional contact therewith, and a locking ring threaded upon the sleeve and bearing from outside against said retaining plate.

4. In combination with a pencil having an operative end, a cylindrical sleeve adapted to be mounted upon the pencil in an adjustably spaced relation to the operative end thereof, a rubber lining within the cylinder for a frictional grip upon said pencil, the sleeve including a flange at one end and being externally threaded on the other end, a spool mounted on the sleeve and adapted to rotate thereabout, a rubber disk axial iy seated upon the spool for rotation therewith, and a locking ring threaded upon the sleeve to retain the spool in place. 5. In combination with a pencil having an operative end, a cylindrical sleeve adapted to be mounted upon the pencil in an adjustably spaced relation to the operative end thereof, a rubber lining within the cylinder for a frictional grip upon said pencil, the sleeve including a flange at one end and being externally threaded on the other end, a spool mounted on the sleeve and adapted to rotate thereabout, a retaining plate adjoining said spool, and a locking ring bearing against said retaining plate from outside to retain the spool upon the sleeve.

JAMES F. FITZGERALD.

REFERENCES CITED The following references are of record in the file of this patent:

FOREIGN PATENTS Number Country Date 16,586 Switzerland Apr. 21, 1898 389,129 France Sept. 1, 1908 

